Heavy duty scraper



Nov. 5, 1940. M. L1. 'BRODERSEN HEAVY DUTY SCRAPER Original Filed Feb. 11, 1939 2 Sheets-Sheet 1 Nov. 5, 1940- M. M. BRjODERSEN HEAVY DUTY SCRAPER Original Filed Feb. 11, 1939 2 Sheets- Sheet 2 Patented Nov. 5, 1940 UNITED STATES PATENT OFFICE Claims. (01.. 37 -125) I This invention :relates to improvements in heavy duty earth handling, or scraper apparatus of the type showni in-my' applicaition'IOrLetteis Patent filed February 11, 1939, Serial No. 255,885,

- "6 and the present application being a division of said earlier application.

The main object of my'invention is to provide a haulingsc'raperin .which the bowlincludes a pair 'ofspeced apart side members which are a lo .partof the-frame structure, and a bottornhand a back hinged together forming a separate unit interposed between the side members. The forward dge oi the bottom member is supported on'the side membersby means of longitudinally movable pivots and the back is arranged for vertical. movement effectedby cable'power means: sothat for dumping the 'load the back, of the bowl is raised vertically thereby moving the front 'edgeof the bottom rearwardly, and conse- "20 quently tilting said bottom which causes the "The movable pivotsare placed .in a. position 'nearthe "forward edge-of the bowl bottom which permits tilting thebottom :from the carrying to 28 the dumpingposition and vice versa'witl'i a minimumvariation in the height of'the forwardfedge with respect tothe ground surface. Thismakes it possible to control the spreading of thei-load and leveling of the :earth to a ilnerldegreethan :in' other types of hauling-scrapers "where the bowl is swung about a pivot ass unit. In the scrapers as heretofore used, the variation of 'theheight of the forward edge of the bowl bottom between the carrying and dumping posi- Il tions is so considerable that during the spreading and leveling-operations, in addition to controlling the tilting oithebowl, it must be raised or lowered as the occasion demands and sincethe tilting of the bowl and its raisingand lowering iseifected by separate controls, the operator must be an expert to manipulate "both controls in .proper timing simultaneously or in succession in 4 order to obtain a fair result, With my scraper, the operator raises the bowlto the :desired height for a spreading the load, then controls the tilting of the bowl bottom todischargethe load-as needed. Thus-byhaving only one control to manipulate, theoperator can; more readily observe the'o'peration :performed and accordingly control the imso plement'with greater flexibility andlaccuracy, .and thereby do the work with higher-degree of perfection.- r, v I

I have also mounted and arranged the apron, which--acts-:as arlnad :retaining closure for the .u frontend ofthe bowl, so that in the scrapingand loading operation-said ,apronmay bepartially lowered to act as ashoe for spreading evenly and tamping down the scraped earth as it is accumulated in front of the'bowl so that a uniformvolume of-flrmly packed earthenters the bowl. This makes it possible toload a greater amount of earth into the bowl and also eliminates the wasteful traction power surges which result from uneven scraping and loading.

with these and other objects in view, the invention consists in the combination, correlation, and' construction of parts, members, and features which. will be described in the specification and I will be finally pointed out lnthe claims.

Referring to the drawings: Figure 1 is a side view of the scraper embodying myinvention.

Figure 2 is a sectional elevation of the scraper in the dumping position.

The invention exemplified in the accompanying drawings includes a frame structure comprising a forward section In and a rear section 2a. The forward frame section is consists of a pair of spaced apart side'arms is rigidly connected at i the forward ends to a cross member 4a which in turn has centrally interposed between the ends thereof. a forwardly extending and downwardly depending leg la swivelably supported, asa't-ia, on a wheeled carriage la which is adapted for connection to the draw bar of a tractor. The rear ends of the side arms la are inclined down- .the axle Ila of a rear wheeled carriage a.

'Ihe rear frame section 2a is interposed between the side arms to and comprises a pair of spaced apart side plates to having a generally pentagrammatic contour. The side plates, 8a arerigidwardly and pivotally supported at the ends on ly connected at the upper forwardly extending corner to a tubular cross member 9a, and at the upperv and lower edges near the rearends to cross members Illa and Ila respectively. The

rear ends of the plates, la are connected-rigidly to the axle Ila of the rear wheel can'lage Ila.

Side arms la are provided with upwardly extending brackets I la connected at the upper ends thereof to a tubularcross member "a which in turn has secured thereto intermediate its ends aset of live spaced apart ears 20a, The cars 20a extend upwardly and are inclined slightly toward the front and carry at the ends thereof a, shaft 20a which in turn carries four sheaves flablournaled thereon in an interposed relation between I 7 tween the side plates 8a with clearance relation thereto and comprises a bottom 11 having at turn,carries Journaled thereon three sheaves Ila interposed between said ears 23a. The frame la is also provided with a pairof-sheaves 20a ,ipur- .naledin brackets 29a on the cross member la and'a pair of sheaves 30a iournaled inbmkets Ilaontheleg 5a.

A cable 28a anchored or dead-ended as at 21a, is reaved between three of the sheaves 12aand two of the'sheaves 25a and is then passed under one of the sheaves 28a and over one of the sheaves 30a,.then passed through swiveled sheave 32a and connected to a suitable power controlled device on the tractor. By pulling and releasing the cable 26: a vertical swinging-movcment is imparted to the rear frame section In about the axle iSa of the rear wheeled carriagei la. .An earth carrying bowl "a is interposed bethe front edge thereof a scraper blade 18 and a hinge at the rear edge thereof associated with the bottom edge of a back Ill. The side edges of the bottom 11 some front thereof are provided with vertical webs II on which are mounted pins l2 having Journaled thereon rollers 83 adapted to engage slots 40a in the side plates to. The back 80 is provided at each side thereof with a pair of rearwardly extending lugs 84 which are spaced apart so that one is mounted near the bottom and the other near the top thereof. The lugs 84v carry pivotally mounted thereon rollers I! which are adapted to engage'verticai channels "a. The back 80 is also provided with four spaced apart and rearwardly extending lobes 52a carrying interposed therebetween three sheaves "a journaled on shaft 54a.

The vertical channels "a are secured to inner sidcs of side plates la and their upwardly extending ends are connected to a cross member 14 and are reinforced by means of braces 15 on the cross member Illa. Additional braces I. are interposed between the cross member I4 and the axle I31: and carry at the upper ends thereof three sheaves 49a journaled on a shaft lila The receiving end of the bowl "a is provided with an apron or closure "a. A pair of arms la are provided at the sides of the apron, which extend rearwardly along the outside of side plates la, with clearance relation thereto and are pivotally connected at the ends, as at "a, to the side plates 80. The closure 59a comprises a bottom "a in which about half of the surface is substantially horizontal when viewed in the closed position. See Figure 1. The other half is inclined upwardly toward the front forming a shoe which is used for uniformly spreading and tamping down the accumulated scraped up earth in front of the bowl to facilitate uniform loading I of the bowl.

The apron 59a is provided with a pair of spaced apart lugs 64a carrying a shaft .60 on which is Journaled a sheave "a in an interposed relation between said lugs a.

A cable 61a anchored, as at "a, on the back of the bowl 33a is reaved between the sheaves 49a and 53a and passed over a sheave 22a on cross member i9a and sheave 25a on cross member 9a, then passed under sheave "a on the apron 59a, over a sheave 28a on crossmember 4a and, sheave 30a on the leg 5a and then passed through the swiveled sheave Ila to be connected on'the'tracton, .1

lowers the apron "a. l

In practice .for digging and scraping'it is pre-' ferred to keep the apron-in a lowered position a matte-oi assassinate tiara;

The apron and bowl peai ionaws Assuming that the implement-is in? position as showninI'ig'urel, and iii-is desired to" dump the laid, a pulling forceis ex-j he load .erted. oncable i-la whichlcauses the'aprons tofl' raise flrst'by virtue crime rm that, it is lighter in weight than the bowl and offers less resistance to the-pull. After the apron has come to restagainst the cross member In as shown in Figure 2, further pull on cable "I raises the back 80 of the bowl "a vertically by virtue of the guiding rollers in channels Ila, causing the blade end of the bowl to recede rearwsrdly inwa substantially horizontal plane by virtueof the guiding rollers l3 and slots 40a inside plates. This movement causes the bottom 11 to tilt, as shown in Figure 2, thereby discharging theload.

1 Upon releasing cable "a, the bowl is returned, to the digging position'by gravity, asshown- ,in' After the bowl comes to a stopmbyf,

Figure 1. v virtue of the guiding rollers ll 'resting o'n the cross member I la further releasing of the'cable so that a narrow gapis maintained between the blade II and the lower. edge of the apron to permit a restricted amount of earth to enter the bowl. evenly and tamp down the scraped up earth ac- The apron then acts as a shoe to spread cumulated in front of the bowl, thus effecting a uniform loading and eliminating the traction power surges resultant in loading uneven amounts .said secondary frame, a bowl comprising side elemerits-which are a part of the secondary frame,

a back associated with-said side elements for vertical movement relative' thereto, a bottom hinged at the rear to saidback, horizontally movable means connecting the front of said bottom to said side elements, and power means associ-' ated with said back and said secondary frame for imparting vertical movement to the back thereby causing longitudinal movement of the front edge of said bottom.

2. A power scraper comprising a primary frame structure supported at the frontand rear on wheeled carriages, a secondary frame structure including a pair of spaced apart side plates, pivotal means for supporting said secondary frame on said rear wheeled carriage, cable power means associated with the front of the secondary frame and the primary frame for imparting vertical movement to said secondary frame, a bowl comprising a back and a bottom hinged together and interposedbetween said side plates, said side plates being side closures for the bowl, longitudinally slidable pivot means for supporting the front of said bottom on the side plates, vertically siidable means for connecting the backto said side plates, and cable power means associated with the back and the secondary frame for imparting vertical movement to said back and thereby longitudinal movement to the front edge of said bottom thus tilting the bottom.

3. A power scraper comprising a front frame structure having. opposite side members extending rearwardly, a front running gear unit sup,- porting the forward end of said frame structure, a rear running gear unit supporting the ends 5 of said side members, a rear frame section having opposite side. plates disposed between the side members with clearance relation thereto and supported on the rear running gear unit, a power means associated with the front and rear frame sections for imparting vertical. movement to the rear frame section, a bottom having a scraper blade attached to the front edge and a back pivotally connected to the rear edge thereof, said bottom and back being disposed between said side plates with clearance relation thereto, a

closure for the front end of said bowl,'means for connecting the front edge of said bottom to the side plates for longitudinal movement relative thereto, means for connecting the back to said side plates for vertical movement relative thereto,

and power means for imparting vertical movement to said back and thereby causing longitudinal movement of the front edge of said bot,- tom thus tilting said bottom. 4. A power scraper comprising a front frame structure having opposite side members extending rearwardly, a front running gear unit supporting the forward end of said frame structure, a rear running gear unit supporting the ends of said side members, a rear frame section having opposite side plates disposed between said side members with clearance relation thereto and sup-' ported on the rear running gear unit, power means associated with the front and rear frame 5 sections for imparting vertical movement to the rear frame section, a bowl comprising a bottom having hingedly attached thereto a back at the rear and having a scraper blade at the front thereof disposed between said side plates with 40 clearance relation thereto, means connecting'the front of said bottom to the side plates for longitudinal movement with respect to said side plates, means for connecting the back to the side plates for vertical movement with respect to said side plates, and power means for imparting vertical movement to said back causing longitudinal movement of the front of said bottom and thereby tilting said bottom.

5. In a power scraper comprising a frame 5 structure supported at both ends thereof on running gear units and arranged for vertical movement with relation to the ground surface. a scraper bowl comprising spaced apart side elements attached to said frame structure, a bot- 10 tom provided with a back 'hingedly connected atthe rear thereof and disposed between said side elements with clearance relation thereto, means connecting the front end of said bottom to the. side elements, for longitudinal movement relative thereto, means for connecting the back to the side elements for vertical movement relative thereto, and power means for imparting vertical movement to said back thereby causing longitudinal movement of the front edge of said bottom. 20

6. In a dirtmoving machine, a primary frame structure supported at the front and rear on wheeled carriages, a secondary frame structure including a pair of spaced apart side plates, pivotal means for supporting the secondary frame 25 structure on the rear carriage, cable means associated with said frame structures for raising and lowering the secondary frame structure, a scraper bowl comprising a bottom and a back hingedly associated together and disposed between said 8) side plates with clearance relation thereto, said side plates being side closures for said bowl, a closure for the front end of said bowl, means for connecting the front end of said bowl bottom to said side plates for longitudinal movement,

means connecting the back of saidbowl to said side plates for vertical movement, and cable means associated with said bowl closure, said secondary frame and said bowl for actuating said bowl closure and for imparting vertical movement to the back of said bowl thereby causing longitudinal movement of the front edge of the bowl bottom thus tilting said bottom.

, MAX M. BRODERSEN. 

